v2.8.0

changelog.md

@@ -1,5 +1,28 @@
 # Changelog
 
+## 2025-12-15 - 2.8.0 - feat(commit)
+Add commit configuration and automatic pre-commit tests
+
+- Add CommitConfig class to manage @git.zone/cli.commit settings in npmextra.json (alwaysTest, alwaysBuild).
+- Export CommitConfig from mod_config for use by the CLI.
+- Add 'gitzone config commit' subcommand with interactive and direct-setting modes (alwaysTest, alwaysBuild).
+- Merge CLI flags and npmextra config: -t/--test and -b/--build now respect commit.alwaysTest and commit.alwaysBuild.
+- Run 'pnpm test' early in the commit flow when tests are enabled; abort the commit on failing tests and log results.
+- Update commit UI/plan to show the test option and include the test step when enabled.
+- Add 'gitzone config services' entry to configure services via ServiceManager.
+
+## 2025-12-14 - 2.7.0 - feat(mod_format)
+Add check-only formatting with interactive diff preview; make formatting default to dry-run and extend formatting API
+
+- Add BaseFormatter.check(), displayDiff() and displayAllDiffs() to compute and render diffs without applying changes.
+- Extend runFormatter API with new options: write (use to apply changes), checkOnly (only check for diffs), and showDiff (display diffs). When checkOnly is used, runFormatter returns an ICheckResult.
+- Change default formatting behavior to dry-run. Use --write / -w to actually apply changes. CLI format command updated to respect --write/-w.
+- Add formatNpmextraWithDiff in mod_config to preview diffs for npmextra.json and prompt the user before applying changes; calls to add/remove/clear registries and set access level now use this preview flow.
+- Project.fromCwd now accepts an options object ({ requireProjectType?: boolean }) so callers can skip the projectType requirement when appropriate; runFormatter no longer requires projectType for certain formatters.
+- Introduce a list of formatters that don't require projectType: npmextra, prettier, cleanup, packagejson.
+- Export the ICheckResult type from the formatter module and update mod_format interfaces to include ICheckResult.
+- Bump dependency @push.rocks/smartdiff to ^1.1.0.
+
 ## 2025-12-14 - 2.6.1 - fix(npmextra)
 Normalize npmextra.json: move tsdoc legal entry and reposition @git.zone/cli configuration
 

package.json

@@ -1,7 +1,7 @@
 {
   "name": "@git.zone/cli",
   "private": false,
-  "version": "2.6.1",
+  "version": "2.8.0",
   "description": "A comprehensive CLI tool for enhancing and managing local development workflows with gitzone utilities, focusing on project setup, version control, code formatting, and template management.",
   "main": "dist_ts/index.ts",
   "typings": "dist_ts/index.d.ts",
@@ -76,7 +76,7 @@
     "@push.rocks/npmextra": "^5.3.3",
     "@push.rocks/projectinfo": "^5.0.2",
     "@push.rocks/smartcli": "^4.0.19",
-    "@push.rocks/smartdiff": "^1.0.3",
+    "@push.rocks/smartdiff": "^1.1.0",
     "@push.rocks/smartfile": "^13.1.2",
     "@push.rocks/smartfs": "^1.2.0",
     "@push.rocks/smartgulp": "^3.0.4",

pnpm-lock.yaml

@@ -36,8 +36,8 @@ importers:
         specifier: ^4.0.19
         version: 4.0.19
       '@push.rocks/smartdiff':
-        specifier: ^1.0.3
-        version: 1.0.3
+        specifier: ^1.1.0
+        version: 1.1.0
       '@push.rocks/smartfile':
         specifier: ^13.1.2
         version: 13.1.2
@@ -1042,8 +1042,8 @@ packages:
   '@push.rocks/smartdelay@3.0.5':
     resolution: {integrity: sha512-mUuI7kj2f7ztjpic96FvRIlf2RsKBa5arw81AHNsndbxO6asRcxuWL8dTVxouEIK8YsBUlj0AsrCkHhMbLQdHw==}
 
-  '@push.rocks/smartdiff@1.0.3':
-    resolution: {integrity: sha512-cXUKj0KJBxnrZDN1Ztc2WiFRJM3vOTdQUdBfe6ar5NlKuXytSRMJqVL8IUbtWfMCSOx6HgWAUT7W68+/X2TG8w==}
+  '@push.rocks/smartdiff@1.1.0':
+    resolution: {integrity: sha512-AAz/unmko0C+g+60odOoK32PE3Ci3YLoB+zfg1LGLyVRCthcdzjqa1C2Km0MfG7IyJQKPdj8J5HPubtpm3ZeaQ==}
 
   '@push.rocks/smartdns@7.6.1':
     resolution: {integrity: sha512-nnP5+A2GOt0WsHrYhtKERmjdEHUchc+QbCCBEqlyeQTn+mNfx2WZvKVI1DFRJt8lamvzxP6Hr/BSe3WHdh4Snw==}
@@ -2536,9 +2536,6 @@ packages:
   fast-deep-equal@3.1.3:
     resolution: {integrity: sha512-f3qQ9oQy9j2AhBe/H9VC91wLmKBCCU/gDOnKNAYG5hswO7BLKj09Hc5HYNz9cGI++xlpDCIgDaitVs03ATR84Q==}
 
-  fast-diff@1.3.0:
-    resolution: {integrity: sha512-VxPP4NqbUjj6MaAOafWeUn2cXWLcCtljklUtZf0Ind4XQ+QPtmA0b18zZy0jIQx+ExRVCR/ZQpBmik5lXshNsw==}
-
   fast-fifo@1.3.2:
     resolution: {integrity: sha512-/d9sfos4yxzpwkDkuN7k2SqFKtYNmCTzgfEpz82x34IM9/zc8KGxQoXg1liNC/izpRM/MBdt44Nmx41ZWqk+FQ==}
 
@@ -6049,9 +6046,9 @@ snapshots:
     dependencies:
       '@push.rocks/smartpromise': 4.2.3
 
-  '@push.rocks/smartdiff@1.0.3':
+  '@push.rocks/smartdiff@1.1.0':
     dependencies:
-      fast-diff: 1.3.0
+      diff: 8.0.2
 
   '@push.rocks/smartdns@7.6.1':
     dependencies:
@@ -8145,8 +8142,6 @@ snapshots:
 
   fast-deep-equal@3.1.3: {}
 
-  fast-diff@1.3.0: {}
-
   fast-fifo@1.3.2: {}
 
   fast-json-stable-stringify@2.1.0: {}

ts/00_commitinfo_data.ts

@@ -3,6 +3,6 @@
  */
 export const commitinfo = {
   name: '@git.zone/cli',
-  version: '2.6.1',
+  version: '2.8.0',
   description: 'A comprehensive CLI tool for enhancing and managing local development workflows with gitzone utilities, focusing on project setup, version control, code formatting, and template management.'
 }

ts/classes.project.ts

@@ -8,10 +8,11 @@ import type { TGitzoneProjectType } from './classes.gitzoneconfig.js';
  * the Project class is a tool to work with a gitzone project
  */
 export class Project {
-  public static async fromCwd() {
+  public static async fromCwd(options: { requireProjectType?: boolean } = {}) {
     const gitzoneConfig = await GitzoneConfig.fromCwd();
     const project = new Project(gitzoneConfig);
-    if (!project.gitzoneConfig.data.projectType) {
+    const requireProjectType = options.requireProjectType ?? true;
+    if (requireProjectType && !project.gitzoneConfig.data.projectType) {
       throw new Error('Please define a project type');
     }
     return project;

ts/gitzone.cli.ts

@@ -80,7 +80,9 @@ export let run = async () => {
     }
 
     // Handle format with options
+    // Default is dry-mode, use --write/-w to apply changes
     await modFormat.run({
+      write: argvArg.write || argvArg.w,
       dryRun: argvArg['dry-run'],
       yes: argvArg.yes,
       planOnly: argvArg['plan-only'],

ts/mod_commit/index.ts

@@ -8,9 +8,20 @@ import * as ui from './mod.ui.js';
 import { ReleaseConfig } from '../mod_config/classes.releaseconfig.js';
 
 export const run = async (argvArg: any) => {
-  // Check if release flag is set and validate registries early
+  // Read commit config from npmextra.json
+  const npmextraConfig = new plugins.npmextra.Npmextra();
+  const gitzoneConfig = npmextraConfig.dataFor<{
+    commit?: {
+      alwaysTest?: boolean;
+      alwaysBuild?: boolean;
+    };
+  }>('@git.zone/cli', {});
+  const commitConfig = gitzoneConfig.commit || {};
+
+  // Check flags and merge with config options
   const wantsRelease = !!(argvArg.r || argvArg.release);
-  const wantsBuild = !!(argvArg.b || argvArg.build);
+  const wantsTest = !!(argvArg.t || argvArg.test || commitConfig.alwaysTest);
+  const wantsBuild = !!(argvArg.b || argvArg.build || commitConfig.alwaysBuild);
   let releaseConfig: ReleaseConfig | null = null;
 
   if (wantsRelease) {
@@ -28,6 +39,7 @@ export const run = async (argvArg: any) => {
   ui.printExecutionPlan({
     autoAccept: !!(argvArg.y || argvArg.yes),
     push: !!(argvArg.p || argvArg.push),
+    test: wantsTest,
     build: wantsBuild,
     release: wantsRelease,
     format: !!argvArg.format,
@@ -39,6 +51,21 @@ export const run = async (argvArg: any) => {
     await formatMod.run();
   }
 
+  // Run tests early to fail fast before analysis
+  if (wantsTest) {
+    ui.printHeader('🧪 Running tests...');
+    const smartshellForTest = new plugins.smartshell.Smartshell({
+      executor: 'bash',
+      sourceFilePaths: [],
+    });
+    const testResult = await smartshellForTest.exec('pnpm test');
+    if (testResult.exitCode !== 0) {
+      logger.log('error', 'Tests failed. Aborting commit.');
+      process.exit(1);
+    }
+    logger.log('success', 'All tests passed.');
+  }
+
   ui.printHeader('🔍 Analyzing repository changes...');
 
   const aidoc = new plugins.tsdoc.AiDoc();
@@ -161,6 +188,7 @@ export const run = async (argvArg: any) => {
   }
 
   // Determine total steps based on options
+  // Note: test runs early (like format) so not counted in numbered steps
   const willPush = answerBucket.getAnswerFor('pushToOrigin') && !(process.env.CI === 'true');
   const willRelease = answerBucket.getAnswerFor('createRelease') && releaseConfig?.hasRegistries();
   let totalSteps = 5; // Base steps: commitinfo, changelog, staging, commit, version

ts/mod_commit/mod.ui.ts

@@ -21,6 +21,7 @@ interface ICommitSummary {
 interface IExecutionPlanOptions {
   autoAccept: boolean;
   push: boolean;
+  test: boolean;
   build: boolean;
   release: boolean;
   format: boolean;
@@ -64,6 +65,7 @@ export function printExecutionPlan(options: IExecutionPlanOptions): void {
   console.log('  Options:');
   console.log(`    Auto-accept     ${options.autoAccept ? '✓ enabled (-y)' : '○ interactive mode'}`);
   console.log(`    Push to remote  ${options.push ? '✓ enabled (-p)' : '○ disabled'}`);
+  console.log(`    Test first      ${options.test ? '✓ enabled (-t)' : '○ disabled'}`);
   console.log(`    Build & verify  ${options.build ? '✓ enabled (-b)' : '○ disabled'}`);
   console.log(`    Release to npm  ${options.release ? '✓ enabled (-r)' : '○ disabled'}`);
   if (options.format) {
@@ -77,6 +79,9 @@ export function printExecutionPlan(options: IExecutionPlanOptions): void {
   if (options.format) {
     console.log(`    ${stepNum++}. Format project files`);
   }
+  if (options.test) {
+    console.log(`    ${stepNum++}. Run tests`);
+  }
   console.log(`    ${stepNum++}. Analyze repository changes`);
   console.log(`    ${stepNum++}. Bake commit info into code`);
   console.log(`    ${stepNum++}. Generate changelog.md`);

ts/mod_config/classes.commitconfig.ts

@@ -0,0 +1,104 @@
+import * as plugins from './mod.plugins.js';
+
+export interface ICommitConfig {
+  alwaysTest: boolean;
+  alwaysBuild: boolean;
+}
+
+/**
+ * Manages commit configuration stored in npmextra.json
+ * under @git.zone/cli.commit namespace
+ */
+export class CommitConfig {
+  private cwd: string;
+  private config: ICommitConfig;
+
+  constructor(cwd: string = process.cwd()) {
+    this.cwd = cwd;
+    this.config = { alwaysTest: false, alwaysBuild: false };
+  }
+
+  /**
+   * Create a CommitConfig instance from current working directory
+   */
+  public static async fromCwd(cwd: string = process.cwd()): Promise<CommitConfig> {
+    const instance = new CommitConfig(cwd);
+    await instance.load();
+    return instance;
+  }
+
+  /**
+   * Load configuration from npmextra.json
+   */
+  public async load(): Promise<void> {
+    const npmextraInstance = new plugins.npmextra.Npmextra(this.cwd);
+    const gitzoneConfig = npmextraInstance.dataFor<any>('@git.zone/cli', {});
+
+    this.config = {
+      alwaysTest: gitzoneConfig?.commit?.alwaysTest ?? false,
+      alwaysBuild: gitzoneConfig?.commit?.alwaysBuild ?? false,
+    };
+  }
+
+  /**
+   * Save configuration to npmextra.json
+   */
+  public async save(): Promise<void> {
+    const npmextraPath = plugins.path.join(this.cwd, 'npmextra.json');
+    let npmextraData: any = {};
+
+    // Read existing npmextra.json
+    if (await plugins.smartfs.file(npmextraPath).exists()) {
+      const content = await plugins.smartfs.file(npmextraPath).encoding('utf8').read();
+      npmextraData = JSON.parse(content as string);
+    }
+
+    // Ensure @git.zone/cli namespace exists
+    if (!npmextraData['@git.zone/cli']) {
+      npmextraData['@git.zone/cli'] = {};
+    }
+
+    // Ensure commit object exists
+    if (!npmextraData['@git.zone/cli'].commit) {
+      npmextraData['@git.zone/cli'].commit = {};
+    }
+
+    // Update commit settings
+    npmextraData['@git.zone/cli'].commit.alwaysTest = this.config.alwaysTest;
+    npmextraData['@git.zone/cli'].commit.alwaysBuild = this.config.alwaysBuild;
+
+    // Write back to file
+    await plugins.smartfs
+      .file(npmextraPath)
+      .encoding('utf8')
+      .write(JSON.stringify(npmextraData, null, 2));
+  }
+
+  /**
+   * Get alwaysTest setting
+   */
+  public getAlwaysTest(): boolean {
+    return this.config.alwaysTest;
+  }
+
+  /**
+   * Set alwaysTest setting
+   */
+  public setAlwaysTest(value: boolean): void {
+    this.config.alwaysTest = value;
+  }
+
+  /**
+   * Get alwaysBuild setting
+   */
+  public getAlwaysBuild(): boolean {
+    return this.config.alwaysBuild;
+  }
+
+  /**
+   * Set alwaysBuild setting
+   */
+  public setAlwaysBuild(value: boolean): void {
+    this.config.alwaysBuild = value;
+  }
+}

ts/mod_config/index.ts

@@ -2,9 +2,32 @@
 
 import * as plugins from './mod.plugins.js';
 import { ReleaseConfig } from './classes.releaseconfig.js';
-import { runFormatter } from '../mod_format/index.js';
+import { CommitConfig } from './classes.commitconfig.js';
+import { runFormatter, type ICheckResult } from '../mod_format/index.js';
 
-export { ReleaseConfig };
+export { ReleaseConfig, CommitConfig };
+
+/**
+ * Format npmextra.json with diff preview
+ * Shows diff first, asks for confirmation, then applies
+ */
+async function formatNpmextraWithDiff(): Promise<void> {
+  // Check for diffs first
+  const checkResult = await runFormatter('npmextra', {
+    checkOnly: true,
+    showDiff: true,
+  }) as ICheckResult | void;
+
+  if (checkResult && checkResult.hasDiff) {
+    const shouldApply = await plugins.smartinteract.SmartInteract.getCliConfirmation(
+      'Apply formatting changes to npmextra.json?',
+      true
+    );
+    if (shouldApply) {
+      await runFormatter('npmextra', { silent: true });
+    }
+  }
+}
 
 export const run = async (argvArg: any) => {
   const command = argvArg._?.[1];
@@ -33,6 +56,12 @@ export const run = async (argvArg: any) => {
     case 'accessLevel':
       await handleAccessLevel(value);
       break;
+    case 'commit':
+      await handleCommit(argvArg._?.[2], argvArg._?.[3]);
+      break;
+    case 'services':
+      await handleServices();
+      break;
     case 'help':
       showHelp();
       break;
@@ -48,7 +77,7 @@ export const run = async (argvArg: any) => {
 async function handleInteractiveMenu(): Promise<void> {
   console.log('');
   console.log('╭─────────────────────────────────────────────────────────────╮');
-  console.log('│  gitzone config - Release Configuration                     │');
+  console.log('│  gitzone config - Project Configuration                     │');
   console.log('╰─────────────────────────────────────────────────────────────╯');
   console.log('');
 
@@ -64,6 +93,8 @@ async function handleInteractiveMenu(): Promise<void> {
       { name: 'Remove a registry', value: 'remove' },
       { name: 'Clear all registries', value: 'clear' },
       { name: 'Set access level (public/private)', value: 'access' },
+      { name: 'Configure commit options', value: 'commit' },
+      { name: 'Configure services', value: 'services' },
       { name: 'Show help', value: 'help' },
     ],
   });
@@ -86,6 +117,12 @@ async function handleInteractiveMenu(): Promise<void> {
     case 'access':
       await handleAccessLevel();
       break;
+    case 'commit':
+      await handleCommit();
+      break;
+    case 'services':
+      await handleServices();
+      break;
     case 'help':
       showHelp();
       break;
@@ -149,8 +186,8 @@ async function handleAdd(url?: string): Promise<void> {
 
   if (added) {
     await config.save();
-    await runFormatter('npmextra', { silent: true });
     plugins.logger.log('success', `Added registry: ${url}`);
+    await formatNpmextraWithDiff();
   } else {
     plugins.logger.log('warn', `Registry already exists: ${url}`);
   }
@@ -185,8 +222,8 @@ async function handleRemove(url?: string): Promise<void> {
 
   if (removed) {
     await config.save();
-    await runFormatter('npmextra', { silent: true });
     plugins.logger.log('success', `Removed registry: ${url}`);
+    await formatNpmextraWithDiff();
   } else {
     plugins.logger.log('warn', `Registry not found: ${url}`);
   }
@@ -212,8 +249,8 @@ async function handleClear(): Promise<void> {
   if (confirmed) {
     config.clearRegistries();
     await config.save();
-    await runFormatter('npmextra', { silent: true });
     plugins.logger.log('success', 'All registries cleared.');
+    await formatNpmextraWithDiff();
   } else {
     plugins.logger.log('info', 'Operation cancelled.');
   }
@@ -252,8 +289,115 @@ async function handleAccessLevel(level?: string): Promise<void> {
 
   config.setAccessLevel(level as 'public' | 'private');
   await config.save();
-  await runFormatter('npmextra', { silent: true });
   plugins.logger.log('success', `Access level set to: ${level}`);
+  await formatNpmextraWithDiff();
+}
+
+/**
+ * Handle commit configuration
+ */
+async function handleCommit(setting?: string, value?: string): Promise<void> {
+  const config = await CommitConfig.fromCwd();
+
+  // No setting = interactive mode
+  if (!setting) {
+    await handleCommitInteractive(config);
+    return;
+  }
+
+  // Direct setting
+  switch (setting) {
+    case 'alwaysTest':
+      await handleCommitSetting(config, 'alwaysTest', value);
+      break;
+    case 'alwaysBuild':
+      await handleCommitSetting(config, 'alwaysBuild', value);
+      break;
+    default:
+      plugins.logger.log('error', `Unknown commit setting: ${setting}`);
+      showCommitHelp();
+  }
+}
+
+/**
+ * Interactive commit configuration
+ */
+async function handleCommitInteractive(config: CommitConfig): Promise<void> {
+  console.log('');
+  console.log('╭─────────────────────────────────────────────────────────────╮');
+  console.log('│  Commit Configuration                                       │');
+  console.log('╰─────────────────────────────────────────────────────────────╯');
+  console.log('');
+
+  const interactInstance = new plugins.smartinteract.SmartInteract();
+  const response = await interactInstance.askQuestion({
+    type: 'checkbox',
+    name: 'commitOptions',
+    message: 'Select commit options to enable:',
+    choices: [
+      { name: 'Always run tests before commit (-t)', value: 'alwaysTest' },
+      { name: 'Always build after commit (-b)', value: 'alwaysBuild' },
+    ],
+    default: [
+      ...(config.getAlwaysTest() ? ['alwaysTest'] : []),
+      ...(config.getAlwaysBuild() ? ['alwaysBuild'] : []),
+    ],
+  });
+
+  const selected = (response as any).value || [];
+  config.setAlwaysTest(selected.includes('alwaysTest'));
+  config.setAlwaysBuild(selected.includes('alwaysBuild'));
+  await config.save();
+
+  plugins.logger.log('success', 'Commit configuration updated');
+  await formatNpmextraWithDiff();
+}
+
+/**
+ * Set a specific commit setting
+ */
+async function handleCommitSetting(config: CommitConfig, setting: string, value?: string): Promise<void> {
+  // Parse boolean value
+  const boolValue = value === 'true' || value === '1' || value === 'on';
+
+  if (setting === 'alwaysTest') {
+    config.setAlwaysTest(boolValue);
+  } else if (setting === 'alwaysBuild') {
+    config.setAlwaysBuild(boolValue);
+  }
+
+  await config.save();
+  plugins.logger.log('success', `Set ${setting} to ${boolValue}`);
+  await formatNpmextraWithDiff();
+}
+
+/**
+ * Show help for commit subcommand
+ */
+function showCommitHelp(): void {
+  console.log('');
+  console.log('Usage: gitzone config commit [setting] [value]');
+  console.log('');
+  console.log('Settings:');
+  console.log('  alwaysTest [true|false]     Always run tests before commit');
+  console.log('  alwaysBuild [true|false]    Always build after commit');
+  console.log('');
+  console.log('Examples:');
+  console.log('  gitzone config commit                    # Interactive mode');
+  console.log('  gitzone config commit alwaysTest true');
+  console.log('  gitzone config commit alwaysBuild false');
+  console.log('');
+}
+
+/**
+ * Handle services configuration
+ */
+async function handleServices(): Promise<void> {
+  // Import and use ServiceManager's configureServices
+  const { ServiceManager } = await import('../mod_services/classes.servicemanager.js');
+  const serviceManager = new ServiceManager();
+  await serviceManager.init();
+  await serviceManager.configureServices();
 }
 
 /**
@@ -269,6 +413,8 @@ function showHelp(): void {
   console.log('  remove [url]                Remove a registry URL');
   console.log('  clear                       Clear all registries');
   console.log('  access [public|private]     Set npm access level for publishing');
+  console.log('  commit [setting] [value]    Configure commit options');
+  console.log('  services                    Configure which services are enabled');
   console.log('');
   console.log('Examples:');
   console.log('  gitzone config show');
@@ -278,5 +424,8 @@ function showHelp(): void {
   console.log('  gitzone config clear');
   console.log('  gitzone config access public');
   console.log('  gitzone config access private');
+  console.log('  gitzone config commit                    # Interactive');
+  console.log('  gitzone config commit alwaysTest true');
+  console.log('  gitzone config services                  # Interactive');
   console.log('');
 }

ts/mod_format/classes.baseformatter.ts

@@ -1,6 +1,6 @@
 import * as plugins from './mod.plugins.js';
 import { FormatContext } from './classes.formatcontext.js';
-import type { IPlannedChange } from './interfaces.format.js';
+import type { IPlannedChange, ICheckResult } from './interfaces.format.js';
 import { Project } from '../classes.project.js';
 
 export abstract class BaseFormatter {
@@ -79,4 +79,94 @@ export abstract class BaseFormatter {
   protected async shouldProcessFile(filepath: string): Promise<boolean> {
     return true;
   }
+
+  /**
+   * Check for diffs without applying changes
+   * Returns information about what would change
+   */
+  async check(): Promise<ICheckResult> {
+    const changes = await this.analyze();
+    const diffs: ICheckResult['diffs'] = [];
+
+    for (const change of changes) {
+      // Skip generic changes that don't have actual content
+      if (change.path === '<various files>') {
+        continue;
+      }
+
+      if (change.type === 'modify' || change.type === 'create') {
+        // Read current content if file exists
+        let currentContent: string | undefined;
+        try {
+          currentContent = await plugins.smartfs.file(change.path).encoding('utf8').read() as string;
+        } catch {
+          // File doesn't exist yet
+          currentContent = undefined;
+        }
+
+        const newContent = change.content;
+
+        // Check if there's an actual diff
+        if (currentContent !== newContent && newContent !== undefined) {
+          diffs.push({
+            path: change.path,
+            type: change.type,
+            before: currentContent,
+            after: newContent,
+          });
+        }
+      } else if (change.type === 'delete') {
+        // Check if file exists before marking for deletion
+        try {
+          const currentContent = await plugins.smartfs.file(change.path).encoding('utf8').read() as string;
+          diffs.push({
+            path: change.path,
+            type: 'delete',
+            before: currentContent,
+            after: undefined,
+          });
+        } catch {
+          // File doesn't exist, nothing to delete
+        }
+      }
+    }
+
+    return {
+      hasDiff: diffs.length > 0,
+      diffs,
+    };
+  }
+
+  /**
+   * Display a single diff using smartdiff
+   */
+  displayDiff(diff: ICheckResult['diffs'][0]): void {
+    console.log(`\n--- ${diff.path}`);
+    if (diff.before && diff.after) {
+      console.log(plugins.smartdiff.formatLineDiffForConsole(diff.before, diff.after));
+    } else if (diff.after && !diff.before) {
+      console.log('  (new file)');
+      // Show first few lines of new content
+      const lines = diff.after.split('\n').slice(0, 10);
+      lines.forEach(line => console.log(`  + ${line}`));
+      if (diff.after.split('\n').length > 10) {
+        console.log('  ... (truncated)');
+      }
+    } else if (diff.before && !diff.after) {
+      console.log('  (file will be deleted)');
+    }
+  }
+
+  /**
+   * Display all diffs from a check result
+   */
+  displayAllDiffs(result: ICheckResult): void {
+    if (!result.hasDiff) {
+      console.log('  No changes detected');
+      return;
+    }
+    for (const diff of result.diffs) {
+      this.displayDiff(diff);
+    }
+  }
 }

ts/mod_format/index.ts

@@ -19,7 +19,8 @@ import { CopyFormatter } from './formatters/copy.formatter.js';
 
 export let run = async (
   options: {
-    dryRun?: boolean;
+    write?: boolean;      // Explicitly write changes (default: false, dry-mode)
+    dryRun?: boolean;     // Deprecated, kept for compatibility
     yes?: boolean;
     planOnly?: boolean;
     savePlan?: string;
@@ -35,7 +36,11 @@ export let run = async (
     setVerboseMode(true);
   }
 
-  const project = await Project.fromCwd();
+  // Determine if we should write changes
+  // Default is dry-mode (no writing) unless --write/-w is specified
+  const shouldWrite = options.write ?? (options.dryRun === false);
+
+  const project = await Project.fromCwd({ requireProjectType: false });
   const context = new FormatContext();
   // Cache system removed - no longer needed
   const planner = new FormatPlanner();
@@ -127,9 +132,9 @@ export let run = async (
       return;
     }
 
-    // Dry-run mode
-    if (options.dryRun) {
-      logger.log('info', 'Dry-run mode - no changes will be made');
+    // Dry-run mode (default behavior)
+    if (!shouldWrite) {
+      logger.log('info', 'Dry-run mode - use --write (-w) to apply changes');
       return;
     }
 
@@ -197,14 +202,27 @@ export const handleCleanBackups = async (): Promise<void> => {
   );
 };
 
+// Import the ICheckResult type for external use
+import type { ICheckResult } from './interfaces.format.js';
+export type { ICheckResult };
+
+// Formatters that don't require projectType to be set
+const formattersNotRequiringProjectType = ['npmextra', 'prettier', 'cleanup', 'packagejson'];
+
 /**
  * Run a single formatter by name (for use by other modules)
  */
 export const runFormatter = async (
   formatterName: string,
-  options: { silent?: boolean } = {}
-): Promise<void> => {
-  const project = await Project.fromCwd();
+  options: {
+    silent?: boolean;
+    checkOnly?: boolean;    // Only check for diffs, don't apply
+    showDiff?: boolean;     // Show the diff output
+  } = {}
+): Promise<ICheckResult | void> => {
+  // Determine if this formatter requires projectType
+  const requireProjectType = !formattersNotRequiringProjectType.includes(formatterName);
+  const project = await Project.fromCwd({ requireProjectType });
   const context = new FormatContext();
 
   // Map formatter names to classes
@@ -227,6 +245,17 @@ export const runFormatter = async (
   }
 
   const formatter = new FormatterClass(context, project);
+
+  // Check-only mode: just check for diffs and optionally display them
+  if (options.checkOnly) {
+    const result = await formatter.check();
+    if (result.hasDiff && options.showDiff) {
+      formatter.displayAllDiffs(result);
+    }
+    return result;
+  }
+
+  // Normal mode: analyze and apply changes
   const changes = await formatter.analyze();
 
   for (const change of changes) {

ts/mod_format/interfaces.format.ts

@@ -39,7 +39,18 @@ export type IPlannedChange = {
   path: string;
   module: string;
   description: string;
-  content?: string; // For create/modify operations
+  content?: string; // New content for create/modify operations
+  originalContent?: string; // Original content for comparison
   diff?: string;
   size?: number;
 };
+
+export interface ICheckResult {
+  hasDiff: boolean;
+  diffs: Array<{
+    path: string;
+    type: 'create' | 'modify' | 'delete';
+    before?: string;
+    after?: string;
+  }>;
+}